]>
Commit | Line | Data |
---|---|---|
1 | #include "../perf.h" | |
2 | #include "util.h" | |
3 | #include "debug.h" | |
4 | #include <api/fs/fs.h> | |
5 | #include <sys/mman.h> | |
6 | #ifdef HAVE_BACKTRACE_SUPPORT | |
7 | #include <execinfo.h> | |
8 | #endif | |
9 | #include <stdio.h> | |
10 | #include <stdlib.h> | |
11 | #include <string.h> | |
12 | #include <errno.h> | |
13 | #include <limits.h> | |
14 | #include <byteswap.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <unistd.h> | |
17 | #include "callchain.h" | |
18 | ||
19 | struct callchain_param callchain_param = { | |
20 | .mode = CHAIN_GRAPH_REL, | |
21 | .min_percent = 0.5, | |
22 | .order = ORDER_CALLEE, | |
23 | .key = CCKEY_FUNCTION | |
24 | }; | |
25 | ||
26 | /* | |
27 | * XXX We need to find a better place for these things... | |
28 | */ | |
29 | unsigned int page_size; | |
30 | int cacheline_size; | |
31 | ||
32 | bool test_attr__enabled; | |
33 | ||
34 | bool perf_host = true; | |
35 | bool perf_guest = false; | |
36 | ||
37 | char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events"; | |
38 | ||
39 | void event_attr_init(struct perf_event_attr *attr) | |
40 | { | |
41 | if (!perf_host) | |
42 | attr->exclude_host = 1; | |
43 | if (!perf_guest) | |
44 | attr->exclude_guest = 1; | |
45 | /* to capture ABI version */ | |
46 | attr->size = sizeof(*attr); | |
47 | } | |
48 | ||
49 | int mkdir_p(char *path, mode_t mode) | |
50 | { | |
51 | struct stat st; | |
52 | int err; | |
53 | char *d = path; | |
54 | ||
55 | if (*d != '/') | |
56 | return -1; | |
57 | ||
58 | if (stat(path, &st) == 0) | |
59 | return 0; | |
60 | ||
61 | while (*++d == '/'); | |
62 | ||
63 | while ((d = strchr(d, '/'))) { | |
64 | *d = '\0'; | |
65 | err = stat(path, &st) && mkdir(path, mode); | |
66 | *d++ = '/'; | |
67 | if (err) | |
68 | return -1; | |
69 | while (*d == '/') | |
70 | ++d; | |
71 | } | |
72 | return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0; | |
73 | } | |
74 | ||
75 | static int slow_copyfile(const char *from, const char *to, mode_t mode) | |
76 | { | |
77 | int err = -1; | |
78 | char *line = NULL; | |
79 | size_t n; | |
80 | FILE *from_fp = fopen(from, "r"), *to_fp; | |
81 | mode_t old_umask; | |
82 | ||
83 | if (from_fp == NULL) | |
84 | goto out; | |
85 | ||
86 | old_umask = umask(mode ^ 0777); | |
87 | to_fp = fopen(to, "w"); | |
88 | umask(old_umask); | |
89 | if (to_fp == NULL) | |
90 | goto out_fclose_from; | |
91 | ||
92 | while (getline(&line, &n, from_fp) > 0) | |
93 | if (fputs(line, to_fp) == EOF) | |
94 | goto out_fclose_to; | |
95 | err = 0; | |
96 | out_fclose_to: | |
97 | fclose(to_fp); | |
98 | free(line); | |
99 | out_fclose_from: | |
100 | fclose(from_fp); | |
101 | out: | |
102 | return err; | |
103 | } | |
104 | ||
105 | int copyfile_mode(const char *from, const char *to, mode_t mode) | |
106 | { | |
107 | int fromfd, tofd; | |
108 | struct stat st; | |
109 | void *addr; | |
110 | int err = -1; | |
111 | ||
112 | if (stat(from, &st)) | |
113 | goto out; | |
114 | ||
115 | if (st.st_size == 0) /* /proc? do it slowly... */ | |
116 | return slow_copyfile(from, to, mode); | |
117 | ||
118 | fromfd = open(from, O_RDONLY); | |
119 | if (fromfd < 0) | |
120 | goto out; | |
121 | ||
122 | tofd = creat(to, mode); | |
123 | if (tofd < 0) | |
124 | goto out_close_from; | |
125 | ||
126 | addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0); | |
127 | if (addr == MAP_FAILED) | |
128 | goto out_close_to; | |
129 | ||
130 | if (write(tofd, addr, st.st_size) == st.st_size) | |
131 | err = 0; | |
132 | ||
133 | munmap(addr, st.st_size); | |
134 | out_close_to: | |
135 | close(tofd); | |
136 | if (err) | |
137 | unlink(to); | |
138 | out_close_from: | |
139 | close(fromfd); | |
140 | out: | |
141 | return err; | |
142 | } | |
143 | ||
144 | int copyfile(const char *from, const char *to) | |
145 | { | |
146 | return copyfile_mode(from, to, 0755); | |
147 | } | |
148 | ||
149 | unsigned long convert_unit(unsigned long value, char *unit) | |
150 | { | |
151 | *unit = ' '; | |
152 | ||
153 | if (value > 1000) { | |
154 | value /= 1000; | |
155 | *unit = 'K'; | |
156 | } | |
157 | ||
158 | if (value > 1000) { | |
159 | value /= 1000; | |
160 | *unit = 'M'; | |
161 | } | |
162 | ||
163 | if (value > 1000) { | |
164 | value /= 1000; | |
165 | *unit = 'G'; | |
166 | } | |
167 | ||
168 | return value; | |
169 | } | |
170 | ||
171 | static ssize_t ion(bool is_read, int fd, void *buf, size_t n) | |
172 | { | |
173 | void *buf_start = buf; | |
174 | size_t left = n; | |
175 | ||
176 | while (left) { | |
177 | ssize_t ret = is_read ? read(fd, buf, left) : | |
178 | write(fd, buf, left); | |
179 | ||
180 | if (ret < 0 && errno == EINTR) | |
181 | continue; | |
182 | if (ret <= 0) | |
183 | return ret; | |
184 | ||
185 | left -= ret; | |
186 | buf += ret; | |
187 | } | |
188 | ||
189 | BUG_ON((size_t)(buf - buf_start) != n); | |
190 | return n; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Read exactly 'n' bytes or return an error. | |
195 | */ | |
196 | ssize_t readn(int fd, void *buf, size_t n) | |
197 | { | |
198 | return ion(true, fd, buf, n); | |
199 | } | |
200 | ||
201 | /* | |
202 | * Write exactly 'n' bytes or return an error. | |
203 | */ | |
204 | ssize_t writen(int fd, void *buf, size_t n) | |
205 | { | |
206 | return ion(false, fd, buf, n); | |
207 | } | |
208 | ||
209 | size_t hex_width(u64 v) | |
210 | { | |
211 | size_t n = 1; | |
212 | ||
213 | while ((v >>= 4)) | |
214 | ++n; | |
215 | ||
216 | return n; | |
217 | } | |
218 | ||
219 | static int hex(char ch) | |
220 | { | |
221 | if ((ch >= '0') && (ch <= '9')) | |
222 | return ch - '0'; | |
223 | if ((ch >= 'a') && (ch <= 'f')) | |
224 | return ch - 'a' + 10; | |
225 | if ((ch >= 'A') && (ch <= 'F')) | |
226 | return ch - 'A' + 10; | |
227 | return -1; | |
228 | } | |
229 | ||
230 | /* | |
231 | * While we find nice hex chars, build a long_val. | |
232 | * Return number of chars processed. | |
233 | */ | |
234 | int hex2u64(const char *ptr, u64 *long_val) | |
235 | { | |
236 | const char *p = ptr; | |
237 | *long_val = 0; | |
238 | ||
239 | while (*p) { | |
240 | const int hex_val = hex(*p); | |
241 | ||
242 | if (hex_val < 0) | |
243 | break; | |
244 | ||
245 | *long_val = (*long_val << 4) | hex_val; | |
246 | p++; | |
247 | } | |
248 | ||
249 | return p - ptr; | |
250 | } | |
251 | ||
252 | /* Obtain a backtrace and print it to stdout. */ | |
253 | #ifdef HAVE_BACKTRACE_SUPPORT | |
254 | void dump_stack(void) | |
255 | { | |
256 | void *array[16]; | |
257 | size_t size = backtrace(array, ARRAY_SIZE(array)); | |
258 | char **strings = backtrace_symbols(array, size); | |
259 | size_t i; | |
260 | ||
261 | printf("Obtained %zd stack frames.\n", size); | |
262 | ||
263 | for (i = 0; i < size; i++) | |
264 | printf("%s\n", strings[i]); | |
265 | ||
266 | free(strings); | |
267 | } | |
268 | #else | |
269 | void dump_stack(void) {} | |
270 | #endif | |
271 | ||
272 | void get_term_dimensions(struct winsize *ws) | |
273 | { | |
274 | char *s = getenv("LINES"); | |
275 | ||
276 | if (s != NULL) { | |
277 | ws->ws_row = atoi(s); | |
278 | s = getenv("COLUMNS"); | |
279 | if (s != NULL) { | |
280 | ws->ws_col = atoi(s); | |
281 | if (ws->ws_row && ws->ws_col) | |
282 | return; | |
283 | } | |
284 | } | |
285 | #ifdef TIOCGWINSZ | |
286 | if (ioctl(1, TIOCGWINSZ, ws) == 0 && | |
287 | ws->ws_row && ws->ws_col) | |
288 | return; | |
289 | #endif | |
290 | ws->ws_row = 25; | |
291 | ws->ws_col = 80; | |
292 | } | |
293 | ||
294 | void set_term_quiet_input(struct termios *old) | |
295 | { | |
296 | struct termios tc; | |
297 | ||
298 | tcgetattr(0, old); | |
299 | tc = *old; | |
300 | tc.c_lflag &= ~(ICANON | ECHO); | |
301 | tc.c_cc[VMIN] = 0; | |
302 | tc.c_cc[VTIME] = 0; | |
303 | tcsetattr(0, TCSANOW, &tc); | |
304 | } | |
305 | ||
306 | static void set_tracing_events_path(const char *tracing, const char *mountpoint) | |
307 | { | |
308 | snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s", | |
309 | mountpoint, tracing, "events"); | |
310 | } | |
311 | ||
312 | static const char *__perf_tracefs_mount(const char *mountpoint) | |
313 | { | |
314 | const char *mnt; | |
315 | ||
316 | mnt = tracefs_mount(mountpoint); | |
317 | if (!mnt) | |
318 | return NULL; | |
319 | ||
320 | set_tracing_events_path("", mnt); | |
321 | ||
322 | return mnt; | |
323 | } | |
324 | ||
325 | static const char *__perf_debugfs_mount(const char *mountpoint) | |
326 | { | |
327 | const char *mnt; | |
328 | ||
329 | mnt = debugfs_mount(mountpoint); | |
330 | if (!mnt) | |
331 | return NULL; | |
332 | ||
333 | set_tracing_events_path("tracing/", mnt); | |
334 | ||
335 | return mnt; | |
336 | } | |
337 | ||
338 | const char *perf_debugfs_mount(const char *mountpoint) | |
339 | { | |
340 | const char *mnt; | |
341 | ||
342 | mnt = __perf_tracefs_mount(mountpoint); | |
343 | if (mnt) | |
344 | return mnt; | |
345 | ||
346 | mnt = __perf_debugfs_mount(mountpoint); | |
347 | ||
348 | return mnt; | |
349 | } | |
350 | ||
351 | void perf_debugfs_set_path(const char *mntpt) | |
352 | { | |
353 | snprintf(debugfs_mountpoint, strlen(debugfs_mountpoint), "%s", mntpt); | |
354 | set_tracing_events_path("tracing/", mntpt); | |
355 | } | |
356 | ||
357 | static const char *find_tracefs(void) | |
358 | { | |
359 | const char *path = __perf_tracefs_mount(NULL); | |
360 | ||
361 | return path; | |
362 | } | |
363 | ||
364 | static const char *find_debugfs(void) | |
365 | { | |
366 | const char *path = __perf_debugfs_mount(NULL); | |
367 | ||
368 | if (!path) | |
369 | fprintf(stderr, "Your kernel does not support the debugfs filesystem"); | |
370 | ||
371 | return path; | |
372 | } | |
373 | ||
374 | /* | |
375 | * Finds the path to the debugfs/tracing | |
376 | * Allocates the string and stores it. | |
377 | */ | |
378 | const char *find_tracing_dir(void) | |
379 | { | |
380 | const char *tracing_dir = ""; | |
381 | static char *tracing; | |
382 | static int tracing_found; | |
383 | const char *debugfs; | |
384 | ||
385 | if (tracing_found) | |
386 | return tracing; | |
387 | ||
388 | debugfs = find_tracefs(); | |
389 | if (!debugfs) { | |
390 | tracing_dir = "/tracing"; | |
391 | debugfs = find_debugfs(); | |
392 | if (!debugfs) | |
393 | return NULL; | |
394 | } | |
395 | ||
396 | if (asprintf(&tracing, "%s%s", debugfs, tracing_dir) < 0) | |
397 | return NULL; | |
398 | ||
399 | tracing_found = 1; | |
400 | return tracing; | |
401 | } | |
402 | ||
403 | char *get_tracing_file(const char *name) | |
404 | { | |
405 | const char *tracing; | |
406 | char *file; | |
407 | ||
408 | tracing = find_tracing_dir(); | |
409 | if (!tracing) | |
410 | return NULL; | |
411 | ||
412 | if (asprintf(&file, "%s/%s", tracing, name) < 0) | |
413 | return NULL; | |
414 | ||
415 | return file; | |
416 | } | |
417 | ||
418 | void put_tracing_file(char *file) | |
419 | { | |
420 | free(file); | |
421 | } | |
422 | ||
423 | int parse_nsec_time(const char *str, u64 *ptime) | |
424 | { | |
425 | u64 time_sec, time_nsec; | |
426 | char *end; | |
427 | ||
428 | time_sec = strtoul(str, &end, 10); | |
429 | if (*end != '.' && *end != '\0') | |
430 | return -1; | |
431 | ||
432 | if (*end == '.') { | |
433 | int i; | |
434 | char nsec_buf[10]; | |
435 | ||
436 | if (strlen(++end) > 9) | |
437 | return -1; | |
438 | ||
439 | strncpy(nsec_buf, end, 9); | |
440 | nsec_buf[9] = '\0'; | |
441 | ||
442 | /* make it nsec precision */ | |
443 | for (i = strlen(nsec_buf); i < 9; i++) | |
444 | nsec_buf[i] = '0'; | |
445 | ||
446 | time_nsec = strtoul(nsec_buf, &end, 10); | |
447 | if (*end != '\0') | |
448 | return -1; | |
449 | } else | |
450 | time_nsec = 0; | |
451 | ||
452 | *ptime = time_sec * NSEC_PER_SEC + time_nsec; | |
453 | return 0; | |
454 | } | |
455 | ||
456 | unsigned long parse_tag_value(const char *str, struct parse_tag *tags) | |
457 | { | |
458 | struct parse_tag *i = tags; | |
459 | ||
460 | while (i->tag) { | |
461 | char *s; | |
462 | ||
463 | s = strchr(str, i->tag); | |
464 | if (s) { | |
465 | unsigned long int value; | |
466 | char *endptr; | |
467 | ||
468 | value = strtoul(str, &endptr, 10); | |
469 | if (s != endptr) | |
470 | break; | |
471 | ||
472 | if (value > ULONG_MAX / i->mult) | |
473 | break; | |
474 | value *= i->mult; | |
475 | return value; | |
476 | } | |
477 | i++; | |
478 | } | |
479 | ||
480 | return (unsigned long) -1; | |
481 | } | |
482 | ||
483 | int filename__read_str(const char *filename, char **buf, size_t *sizep) | |
484 | { | |
485 | size_t size = 0, alloc_size = 0; | |
486 | void *bf = NULL, *nbf; | |
487 | int fd, n, err = 0; | |
488 | char sbuf[STRERR_BUFSIZE]; | |
489 | ||
490 | fd = open(filename, O_RDONLY); | |
491 | if (fd < 0) | |
492 | return -errno; | |
493 | ||
494 | do { | |
495 | if (size == alloc_size) { | |
496 | alloc_size += BUFSIZ; | |
497 | nbf = realloc(bf, alloc_size); | |
498 | if (!nbf) { | |
499 | err = -ENOMEM; | |
500 | break; | |
501 | } | |
502 | ||
503 | bf = nbf; | |
504 | } | |
505 | ||
506 | n = read(fd, bf + size, alloc_size - size); | |
507 | if (n < 0) { | |
508 | if (size) { | |
509 | pr_warning("read failed %d: %s\n", errno, | |
510 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
511 | err = 0; | |
512 | } else | |
513 | err = -errno; | |
514 | ||
515 | break; | |
516 | } | |
517 | ||
518 | size += n; | |
519 | } while (n > 0); | |
520 | ||
521 | if (!err) { | |
522 | *sizep = size; | |
523 | *buf = bf; | |
524 | } else | |
525 | free(bf); | |
526 | ||
527 | close(fd); | |
528 | return err; | |
529 | } | |
530 | ||
531 | const char *get_filename_for_perf_kvm(void) | |
532 | { | |
533 | const char *filename; | |
534 | ||
535 | if (perf_host && !perf_guest) | |
536 | filename = strdup("perf.data.host"); | |
537 | else if (!perf_host && perf_guest) | |
538 | filename = strdup("perf.data.guest"); | |
539 | else | |
540 | filename = strdup("perf.data.kvm"); | |
541 | ||
542 | return filename; | |
543 | } | |
544 | ||
545 | int perf_event_paranoid(void) | |
546 | { | |
547 | int value; | |
548 | ||
549 | if (sysctl__read_int("kernel/perf_event_paranoid", &value)) | |
550 | return INT_MAX; | |
551 | ||
552 | return value; | |
553 | } | |
554 | ||
555 | void mem_bswap_32(void *src, int byte_size) | |
556 | { | |
557 | u32 *m = src; | |
558 | while (byte_size > 0) { | |
559 | *m = bswap_32(*m); | |
560 | byte_size -= sizeof(u32); | |
561 | ++m; | |
562 | } | |
563 | } | |
564 | ||
565 | void mem_bswap_64(void *src, int byte_size) | |
566 | { | |
567 | u64 *m = src; | |
568 | ||
569 | while (byte_size > 0) { | |
570 | *m = bswap_64(*m); | |
571 | byte_size -= sizeof(u64); | |
572 | ++m; | |
573 | } | |
574 | } | |
575 | ||
576 | bool find_process(const char *name) | |
577 | { | |
578 | size_t len = strlen(name); | |
579 | DIR *dir; | |
580 | struct dirent *d; | |
581 | int ret = -1; | |
582 | ||
583 | dir = opendir(procfs__mountpoint()); | |
584 | if (!dir) | |
585 | return -1; | |
586 | ||
587 | /* Walk through the directory. */ | |
588 | while (ret && (d = readdir(dir)) != NULL) { | |
589 | char path[PATH_MAX]; | |
590 | char *data; | |
591 | size_t size; | |
592 | ||
593 | if ((d->d_type != DT_DIR) || | |
594 | !strcmp(".", d->d_name) || | |
595 | !strcmp("..", d->d_name)) | |
596 | continue; | |
597 | ||
598 | scnprintf(path, sizeof(path), "%s/%s/comm", | |
599 | procfs__mountpoint(), d->d_name); | |
600 | ||
601 | if (filename__read_str(path, &data, &size)) | |
602 | continue; | |
603 | ||
604 | ret = strncmp(name, data, len); | |
605 | free(data); | |
606 | } | |
607 | ||
608 | closedir(dir); | |
609 | return ret ? false : true; | |
610 | } |